There are 27 million slaves living in the world today--more than at any time in history. Three hundred thousand of them are impoverished children in Haiti, who "stay with" families as unpaid and uneducated domestic workers, subject to physical, emotional, and sexual abuse. This practice, known locally as restavek ("staying with"), is so widespread that one in ten Haitian children is caught up in this form of slavery.

Jean-Robert Cadet was a restavek in Haiti from the late 1950s until the early 1970s. He told the harrowing story of his youth in Restavec: From...